In this book, two lateral load patterns existing in the FEMA-365 code (the uniform and triangular lateral load patterns) are evaluated.Afterwards, lateral load patterns, high-rise, mid-rise and low-rise structures are considered, load patterns of other structures such as bridges are referred to and other load patterns which have been previously proposed by other researchers are studied. Effects of these load patterns on the results are also discussed in detail. Moreover, a new lateral load pattern is offered for nonlinear static analysis of structural models.This book consists of six chapters: Chapter One: Introduction, Chapter Two: Materials, modeling samples, Chapter Three: Analysis methods and earthquake records, Chapter Four: Types of lateral load distribution patterns, Chapter Five: Evaluation and interpretation of results, Chapter Six: Conclusion