24 IPTEK, Journal of Engineering, Vol. 2, No. 1, 2015 Modeling Response of Concrete Material due to Biaxial Loading using Finite Element Method Software Based Data Iranata 1 , Endah Wahyuni 1 , Aniendhita Rizki Amalia 1 , and Sylvya Anggraini 1 Abstract Generally the concrete behavior can be observed by the experimental analysis. However, since the computer technology development has been increased rapidly, the computer simulations are also able to represent the detail behavior of concrete. This paper presents the modeling response of concrete material subjected to biaxial loading using finite element method software based. The plain concrete plates with dimensions 200mm x 200mm x 50mm and 150mm x 150mm x 50mm are analyzed using various combinations of biaxial loading. The results of the biaxial load combinations are covering the three non-linear regions of compression–compression, compression–tension, and tension–tension. The results of finite element analysis are also show good agreement to the experimental results that been taken from the previous study. The comparison results the difference between analytical and experimental study are less than 5%. Therefore, the concrete material model based on this finite element method software can be used to simulate the responses in the real condition. Keywords Concrete, Material, Biaxial, Finite Element Method Software Based I. INTRODUCTION 1 nerally, the understanding of the structural behaviour is obtained from the experimental research and studies. The experimental testing is very important in order to obtain the detail behaviour of the structural component which is based on the real condition. However, to obtain the detail and accurate experimental results it is also consuming significant efforts, time and funding. Until now, those are the major obstacle of the experimental research and studies. Nowadays, advances in computer technology and numerical methods have allowed the simulation of engineering problems that traditionally have been addressed via experimentation and theoretical models. Some industries have been able to design sophisticated engineered systems based solely on computer simulation. In addition, many complex phenomena, such as airplane crashes and car accidents, can already be analyzed by computer simulations instead of the experimental testing. In the context of structural engineering, using computer simulation to realistically represent the behaviour of structural systems in detail in various situations, such as the global response and the detailed damage to a structure during a severe loading, is also a goal which must be achieved by engineers. 1 Data Iranata, Endah Wahyuni, Aniendhita Rizki Amalia, and Sylvya Anggraini are with Departement of Civil Engineering, Faculty of Civil Engineering and Planning, Institut Teknologi Sepuluh Nopember, Surabaya, 60111. E-mail : iranata_data@yahoo.com; endahwahyuni@gmail.com; aniendhita.ra@gmail.com; pie_sylvya@yahoo.com. One of the numerical methods that commonly able to perform the detail response of the structural component is using finite element method and analysis. The basic concept of finite element analysis is dividing the continuum element into several elements and connected of each others with nodal element. Each element also has several nodes which are also have appropriate degree of freedom. In order to perform the detailed damage of the reinforced concrete structural component, the computer simulation of the concrete material basic response such as uniaxial and biaxial loading should be also presented with very well [1]. Therefore, this paper presents the computer modelling response of concrete material due to biaxial loading using finite element method software based. The behaviour of concrete material is simulated and verified with the experimental results that conduct by [2] and [3]. The linear as well as non-linear response of the concrete material model is simulate and observed to obtain the detail response of the concrete material model. Hence, the concrete material model based on this finite element method software can be used to simulate the responses in the real condition. II. CONCRETE MATERIAL PROPERTIES SUBJECTED TO BIAXIAL LOADING BY EXPERIMENTAL OBSERVATION Figure 1 show a typical biaxial strength envelops for concrete subjected to proportional biaxial loading. Experimental studies by [2] present concrete under conditions of biaxial compression shows values of increased compressive strength is up to about 1.25 f’ c . Another result of the investigation conducted by [3] G brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by IPTEK The Journal of Engineering